1. M. Carmeli,Found. Phys. 15, 175 (1985).
2. M. Carmeli and S. Malin,Found. Phys. 15, 185 (1985).
3. E. Corinaldesi and F. Strocchi,Relativistic Wave Mechanics (North-Holland, Amsterdam, 1963).
4. H. A. Kramers,Proc. Amsterdam Acad. 40, 814 (1937);Handb. Jahrb. Chem. Phys. I, 63, 64 (1934).
5. M. Carmeli,Group Theory and General Relativity (McGraw-Hill, New York, 1977).